The sun is shining (800 w/m2) on two cars, each with 4m2 surface area facing the sun. One is painted black, while the other is painted with bright aluminum paint. What is the difference in the rate of energy absorption between the two cars? 6. What does Kirchoff’s law state? 7. Why will you not get frost on a car parked between two houses, while a car on the street away from the house will be covered in frost, on a clear cool calm night? 8. Why will the car on the street under the same conditions not be covered in frost if there is a light breeze?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
5. The sun is shining (800 w/m2) on two cars, each with 4m2 surface area facing the
sun. One is painted black, while the other is painted with bright aluminum paint.
What is the difference in the rate of energy absorption between the two cars?
6. What does Kirchoff’s law state?
7. Why will you not get frost on a car parked between two houses, while a car on the
street away from the house will be covered in frost, on a clear cool calm night?
8. Why will the car on the street under the same conditions not be covered in frost if
there is a light breeze?
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